BU2B,
No real rules that I can think of. Everybody was just wearing the normal ultra conservative attire. Also it was a windy, overcast day and had just recently rained, so the normal fun-in-the-sun wasn't in play.
My experience overall has been a reduction in these congregation events though. I think Blondie made some good points about why that may be.
I observe a general zombie-like feel to the friends overall. People are just going through the motions. The old confidence of the Franz 80's that I remember as a kid is long gone.
The cong is also such a mixed bag of education, financial means, personalities, and even mental/ emotional health. People usually find those they can deal with and associate occasionally with them.